package Collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo {
    public static void main(String[] args) {
        /*
        Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        //集合重写了Object的toString()方法,返回格式如下：
        //[元素1.toString(),元素2.toString(),元素3.toString(),......]
        System.out.println(c);

        System.out.println("size:"+c.size());

        System.out.println("是否为空集"+c.isEmpty());

        c.clear();
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size());
        System.out.println("是否为空集："+ c.isEmpty());
         */

        Collection c =new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p = new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("是否包含:"+contains);

        c.remove(p);
        System.out.println(c);

        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);

        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);
    }
}
